也许有点晚了，但还有一种方法：

$menu = wp_get_nav_menu_items($menu_id,array(
   \'posts_per_page\' => -1,
   \'meta_key\' => \'_menu_item_object_id\',
   \'meta_value\' => $post->ID // the currently displayed post
));

var_dump($menu[0]->ID);

这应该可以解决问题How to get current-menu-item title as variable?

但是改变

$GLOBALS[\'wpse16243_title\'] = $menu_item->title;

$GLOBALS[\'wpse16243_title\'] = $menu_item->ID;

最好的方法是使用nav_menu_css_class 滤器像这样的方法会奏效：

function wpse19375_nav_class( $classes, $item ){
  if( !in_array( \'current-menu-item\', $classes ) )
    return $classes;
  // $item is a \'current-menu-item\' object.
  return $classes;
}

add_filter( \'nav_menu_css_class\', \'wpse19375_nav_class\', 10, 2 );